Baryon Octet Electromagnetic Form Factors in a confining NJL model

Abstract

Electromagnetic form factors of the baryon octet are studied using a Nambu--Jona-Lasinio model which utilizes the proper-time regularization scheme to simulate aspects of colour confinement. In addition, the model also incorporates corrections to the dressed quarks from vector meson correlations in the t-channel and the pion cloud. Comparison with recent chiral extrapolations of lattice QCD results shows a remarkable level of consistency. For the charge radii we find the surprising result $r_E^p<r_E^{{\Sigma }^{+}}$ and $|r_E^n|<|r_E^{{\Xi }^0}|$, whereas the magnetic radii have a pattern largely consistent with a naive expectation based on the dressed quark masses.

7 pages, 4 figures

References in corpus (14)

• Big-Bang Nucleosynthesis
• Ab-initio Determination of Light Hadron Masses
• Ab initio calculation of the neutron-proton mass difference
• High-precision determination of the electric and magnetic form factors of the proton
• Nucleon Electromagnetic Form Factors
• Nucleon electromagnetic form factors
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• Role of diquark correlations and the pion cloud in nucleon elastic form factors
• Transversity quark distributions in a covariant quark-diquark model
• First Calculation of Hyperon Axial Couplings from Lattice QCD
• Octet baryon electromagnetic form factors in nuclear medium
• Dressed Quark Mass Dependence of Pion and Kaon Form Factors
• SU(3)-flavour breaking in octet baryon masses and axial couplings

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• TMDs of Spin-one Targets: Formalism and Covariant Calculations
• Quark spin and orbital angular momentum from proton GPDs
• Massive Neutron Stars with a Color Superconducting Quark Matter Core
• The magnetic moments and electromagnetic form factors of the decuplet baryons in chiral perturbation theory
• Impact of DCSB and dynamical diquark correlations on proton GPDs
• Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory
• Electromagnetic form factors of octet baryons with the nonlocal chiral effective theory
• Gravitational form factors of hyperons in light-cone QCD
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Contributions to the nucleon form factors from bubble and tadpole diagrams
• The kaon off-shell generalized parton distributions and transverse momentum dependent parton distributions
• Chiral Corrections to Baryon Electromagnetic Form Factors